I need context because I am coming to three conclusions
1) Vader is being sentimental since he's with a kid who probably is at the age that his own kid would have been if he had not "died", Anakin was more loyal to his emotions than the lightside/darkside.
2) That's not the real Vader
3) He's going to beat the kid to death with the tie-fighter and then impale him with he X-wing